After hatching, the larvae of mayflies nicknamed Tisza flower burrow themselves into the mud of rivers, and emerge as imagoes three years later to start their ephemeral, one-day life cycle over the surface to mate. This love dance is a unique spectacle, an exceptional natural phenomenon one can enjoy only for a few hours each year. Palingenia longicauda is the largest mayfly species in Europe; its larvae can be found in large densities in the crumbling, clayey bank of the River Tisza, in underwater colonies.
The short and passionate above-water life and mass swarming of mayflies offers a unique natural spectacle known as the “blooming of the Tisza” in Hungary. The phenomenon is an annual tourist attraction over sunlit sections of the River Tisza and its tributaries.
The phenomenon was officially included in the Collection of Hungaricums on 21 May 2020, on the Day of Szeged.